Ink Set Pigment Resin Compatibility High-Speed Printing
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Solution Overview
Problem
Conventional inkjet inks struggle with achieving sharp image quality and minimizing mixed color bleeding when printing on low-absorption substrates like PET films, especially during high-speed printing.
Innovation Solution
The use of an ink set comprising white and color inks, where each ink includes a pigment, a pigment dispersing resin with either an alkyl chain of 10 or greater or a polyoxyalkylene chain, and an organic solvent with specific properties, such as a boiling point between 180°C and 280°C and surface tension between 20 mN/m and 30 mN/m, to enhance printability and reduce compatibility between the inks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional aqueous inks are used for printing on low-absorption substrates, then the ink can be applied to the substrate, but the image blurs due to excessive absorption and mixed color bleeding occurs
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by specifying precise ranges for surfactant concentration (0.01-5% by weight), organic solvent content (5-40% by weight), and pH (5.0-9.0). These parameter adjustments optimize the ink's interaction with low-absorption substrates to prevent both excessive absorption and mixed color bleeding, thereby improving image sharpness.
Solution Approach 2:
The patent creates a composite ink formulation combining multiple components: water-soluble polymers (0.1-20% by weight), surfactants, organic solvents, and pigments. This composite material approach allows the ink to achieve balanced properties for printing on low-absorption substrates without causing image blur or color mixing issues.
2Productivity
If high-speed printing is performed on less permeable substrates, then productivity increases, but image quality deteriorates due to mixed color bleeding
Solution Approach 1:
The patent optimizes volatile content (5-40% by weight) and surfactant concentration to control drying kinetics. These parameter changes enable the ink to dry at appropriate rates during high-speed printing, preventing mixed color bleeding while maintaining image sharpness and allowing increased productivity.
3Manufacturing precision
If the ink composition is optimized for sharp images, then manufacturing precision improves, but the complexity of ink formulation increases
Solution Approach 1:
The patent establishes specific parameter ranges (surfactant: 0.01-5%, organic solvent: 5-40%, pH: 5.0-9.0) that balance image sharpness with formulation simplicity. By defining these concrete parameters, the patent achieves manufacturing precision without excessive formulation complexity, making the ink practical for industrial application.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in excellent printability and sharp image quality with minimal mixed color bleeding on less permeable substrates, even at high printing speeds, by reducing the compatibility between the inks and improving drying properties.
Implementation Method 1
an organic solvent having a boiling point of at least 180°C but not more than 280°C and a surface tension of at least 20 mN/m but not more than 30 mN/m
Implementation Method 2
a surface tension of at least 20 mN/m but not more than 30 mN/m
Data Source
AI summary
The present invention relates to an ink set for inkjet recording containing a white ink and color inks including a cyan ink, a magenta ink and a yellow ink, wherein each ink independently contains a pigment, a pigment dispersing resin, an organic solvent and water, the pigment dispersing resin A of either the white ink or the color inks has an alkyl chain with a carbon number of 10 or greater, the pigment dispersing resin B of the other of the white ink or the color inks has a polyoxyalkylene chain, and the pigment dispersing resin A and the pigment dispersing resin B are different resins. According to the present invention, an ink set for inkjet recording can be provided that exhibits excellent printability during high-speed printing, even when printing onto less permeable substrates, and is capable of producing sharp image quality with little mixed color bleeding.